Avoid unsafe heap access from audio thread.

third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp

Index: third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp b/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp
index b7dcfba502017f5db926028a233f844fc4581fac..257fc90d4a32dcd4c341fc526ae621a5f549342d 100644
--- a/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/OfflineAudioContext.cpp
@@ -388,17 +388,13 @@ void OfflineAudioContext::HandlePostOfflineRenderTasks() {
 
   // OfflineGraphAutoLocker here locks the audio graph for the same reason
   // above in |handlePreOfflineRenderTasks|.
-  bool did_remove = false;
   {
     OfflineGraphAutoLocker locker(this);
 
     GetDeferredTaskHandler().BreakConnections();
-    did_remove = ReleaseFinishedSourceNodes();
     GetDeferredTaskHandler().HandleDeferredTasks();
     GetDeferredTaskHandler().RequestToDeleteHandlersOnMainThread();
   }
-
-  RemoveFinishedSourceNodes(did_remove);
 }
 
 OfflineAudioDestinationHandler& OfflineAudioContext::DestinationHandler() {